# State-of-the-art requirements verification process applied to numerical finite-element modelling of the deep excavation in soft soils

## TL;DR

This paper introduces a new method for verifying the stability of deep excavations in soft soils using advanced numerical modeling techniques.

## Contribution

A novel requirements verification process is proposed for modeling deep excavations in soft soils using finite-element methods.

## Key findings

- The proposed method successfully models stell sheet pile walls with equivalent bending stiffness and regular geometry.
- Horizontal displacement curves from the model align well with real-world measurements.
- The approach provides satisfactory results for wall deflection and excavation bottom settlement.

## Abstract

The study presents state-of-the-art requirements verification process for the prediction of the stability of the multi-staged deep excavation in submerged soft soil retained by stell sheet pile walls structures applied at the development of elasto-plastic finite element calculation method performed from Cast3M and Plaxis FE codes. Optimization numerical calculation results are proposed for retained walls design and construction on the basis of the horizontal displacement, earth and water pressures measurements. The transformation of the geometry and stiffness of the stell sheet pile walls to the retaining walls of an equivalent bending stiffness on the one hand and regular geometric shapes allowed in this paper to overcome the difficulties of modelling these stell sheet pile walls in 2D with irregular shapes. The horizontal deflection of the wall, the vertical displacement behind the walls, and the settlement of the excavation bottom are given. They have been compared by those obtained by various authors around the world. The results of this approach are satisfactory in view of the horizontal displacement curves obtained on the stell sheet pile walls compared by the measures.